Hello Ludo,
> It’s the first time I see this. My understanding is that Cuirass makes > a GET request on ‘guix publish’ upon build completion. Could there be a > race condition or something that can explain this? Your understanding is correct :). However, looking at the cuirass-remote-server.log file, I found: --8<---------------cut here---------------start------------->8--- 2021-07-29T22:31:48 fetching '/gnu/store/hrn9hj7v1img3il6afh3r036aczvwnyd-xnnpack-0.0-1.bbe8824.drv' from http://141.80.167.185:5558 2021-07-29T22:31:48 Failed to add /gnu/store/slm0x0j05vyl3vqbjhgc0nch6jca9fp3-xnnpack-0.0-1.bbe8824 to store. --8<---------------cut here---------------end--------------->8--- There are quite a few other "Failed to add" traces in the log, and they all seem to involve the machine behind the .185 IP address. Fetching the substitute manually from Berlin works: --8<---------------cut here---------------start------------->8--- wget http://141.80.167.185:5558/nar/slm0x0j05vyl3vqbjhgc0nch6jca9fp3-xnnpack-0.0-1.bbe8824 --no-http-keep-alive --8<---------------cut here---------------end--------------->8--- but using "ensure-path" fails this way: --8<---------------cut here---------------start------------->8--- scheme@(guix-user)> (set-build-options* s "http://141.80.167.185:5558") $1 = #t scheme@(guix-user)> (ensure-path s "/gnu/store/slm0x0j05vyl3vqbjhgc0nch6jca9fp3-xnnpack-0.0-1.bbe8824") substitute: updating substitutes from 'http://141.80.167.185:5558'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% ice-9/boot-9.scm:1669:16: In procedure raise-exception: ERROR: 1. &store-protocol-error: message: "path `/gnu/store/slm0x0j05vyl3vqbjhgc0nch6jca9fp3-xnnpack-0.0-1.bbe8824' does not exist and cannot be created" status: 1 Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue. --8<---------------cut here---------------end--------------->8--- Do you see any reason why ensure-path would fail while wget works? Thanks, Mathieu